Improvement in telegraph-poles



SEGTIUNA tant effin;

IRA Hausnr, or NEW YoRK, N. Y.

Letters Patent No. 114,138, dated April 25, 1871.

IMPROVEMENT IN TELEGRAPH-POLES.

The Schedule referred to in these Letten Patent and making paxt of the sama.

To all wlw/omit may concern Be it known that I, IRA HERSEY, of the city, county, and State of New York, have invented certain new and usefullmprovements in Telegraph-Poles, of which the following is a specification.

My invention relates- -v First, to an insulated sectional telegraph-pole, constructed substantially in the manner and for the purpose herein described.

Second, to the insulation of' the cross-bar upon a telegraph-pole, asset forth.

Figure 1 represents a vertical longitudinal section of a fragment of a telegraph-pole, showing one form of uniting or jointiug the sections.

Figure 2 is also avertical longitudinal section, of a moditied form, of fig. l.

Figure 3 is a similar section, modified.

Figure 4 is a cross-section of the top of atelegraphpole, representing the cross-bar and one method of insulating.

A represents that part .of a telegraph-pole which forms the center or main body and to which the several sections maybe secured, it forming one. This middldpart, which is generally longer than the two extreme or top and bottom sections, may he treated to render-it indestructible by decomposition if desired, though not so necessary as the two ends.

To the lower end ot this main body is secured a section, B, of suicient. length, which is inserted in the earth, and which may or may not be treated to render it indestructible, to suit the constructor.

Various forms may be employed to unite these secn tions, as shown in figs. 1, 2, and 3, and secured in any convenient manner.

rlo insulate these sections in order to render a pole more perfectly non-conducting, sheets s of India rub ber-or other suitable non-conducting material maybe inserted at the joints between the sections, as shown in the several figures, thereby breaking and checking the current of electricity that might otherwise pass ofi' through a pole not iu sections and insulated.,

To secure the sections A B insulated bolts c and insulated nuts l may be employed, as in the several iigures, by using a covering, fr, of India rubber and inserting non-conducting washers e e between the pole and nut, and head of bolt and pole.

To insulate the cross-bar D non-conducting material a is placed between the pole A and the crossbar D, securing the bar to the pole with insulated bolts and nuts, as at the joints of the sections.

Other forms ot' securing the several sections and cross-bar may be employed without departing from my invention.

I claim as my invention- 1. A telegraph-pole having its sections insulated, substantially in the manner and for the purpose herein set forth. l

2. The cross-bar, insulated, upon a telegraph-pole, substantially as herein described.

Witnesses:

S. W. Woon, vW. T. ALMY.

IRA HERSEY. 

